Generally, I don't recommend draining an icebox into the bilge if at all avoidable. Food particles and such often end up in the ice box water, and then in the bilge... and that can lead to a very nasty smelling bilge after a while. Draining to the shower sump makes the most sense, but on many boats, this isn't all that feasible, since the head and the galley are far from each other. Another option would be to install a small shower-type sump with pump for the icebox drain.

The drain to the icebox should have a trap, like that you'd find under a sink otherwise, not only will the water drain out, but most of the cold air as well.

Sailingdog

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Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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